IDK about the back and sides but the top should definitely be on the longer side. Just look through Google images for styles you like and try them out. If you don't know how to style your hair
Buy product from a good brand that has the hold and shine levels you're looking for. After showering, once your hair is almost completely dry, put a small amount on your finger and rub it all over the fronts of your hands. Now you should be able to make your hair do whatever you want. Also, only shampoo once or twice a week, maybe even less. Most of the time you should only use conditioner.